Electrical Performance of a Piezo-inductive Device for Energy Harvesting with Low-Frequency Vibrations

článek v časopise ve Web of Science, Jimp

angličtina

This study presents the experimental evaluation of a piezo-inductive mechanical system for applications of energy harvesting with low-frequency vibrations. The piezo-inductive vibration energy harvester (PI-VEH) device is composed of a voice coil motor (VCM) extracted from a hard disk drive. The proposed design allows the integration of different element types as beams and masses. The dynamic excitations in the system produce a pendular motion carried out by a hybrid arm (rigid-flexible) that generates energy with the rotations (with a coil) and the beam strains (with a piezoelectric material). The electrical assessment was performed through different working modes classified as inductive, inductive with magnetic instabilities, and piezo-inductive. The instabilities in the harvester refer to external forces induced by two magnets that repel each other. The first two inductive configurations were designed as a function of three parameters (length, mass, instability angle) to debug these using the maximum output voltage. The selected experiments were conducted in a piezo-inductive configuration. The results showed two effects on the output voltage-the first one is related to a system without resonances (higher broadband), and the second effect is associated with a multi-resonant system. As a final conclusion, it is pointed out that the electrical performance can be improved with the magnetic instabilities since these considerably amplified the output voltages.

energy harvesting; piezo-inductive energy harvester; vibration energy harvester; vibration power; power scavenging

VARGAS, C.; TINOCO, H.A..

16. 7. 2019

MDPI

BASEL

2076-0825

Actuators

8

3

Švýcarská konfederace

55

69

14

https://www.mdpi.com/2076-0825/8/3/55

http://hdl.handle.net/11012/189009